We would like the Automatic Age generator based on the DOB given, as we would like to send Happy Birthday emails etc and would love to have it personalised based on the age.
Great idea, we need this too!
Should be a built-in feature, but anyway I found a solution for displaying client age and it works fine
Step 1: implement a ‘Today’s date’ date picker field which is updated every day similar to =today() in excel. HS support pointed me to this way of implementing: https://community.hubspot.com/t5/CRM/How-to-create-a-Today-s-date-date-property/td-p/389836
Step 2: create a ‘between dates’ calculation field and input the Birthday Date field and the new ‘Today’s Date’ date field.
Voila! the system automatically calculates the client age and you just add it to your view.
This ‘today’s date’ field workaround is also incredibly helpful to any other custom fields where you need to calculate how long it’s been between today and any other event date. For example I’ve used it to know how long our clients have been clients.
Unfortunately I have not figured out how to build birthday reminders because I can’t get rid of the ‘year’ in the birthday date field 
@DinDjarin That’s gold, thanks!
You can build a birthday reminder by creating a workflow that’s centered around a date field, and reoccurs annually 
Like so:
Hi all, Jeff from the HubSpot product team here. Thanks for your input on this, it’s much appreciated.
Our focus for properties is making it possible for you to build this yourself. Based on the original description, there are a few platform changes needed to accomplish this:
1. Improve date entry for forms.
2. Add support for specific time segments (e.g. “year”) on to Time Between calculated properties.
3. Add “current date” support for Time Between properties.
We will focus on making those changes. We do not plan to deliver a new Date of Birth field at this time.
@jeffvincent it does really require a new property type, its more so that the workflows and filters should be able to go by the month, day and year individually so that you can automatically run calculations like “number of years between”, “month equals to 4” and so on
Why can’t you just implement an age property that automatically calculates based on the date of birth field (date picker type).
I’d do it myself using a HubSpot calculation, but I cant’ make any calculations based on date picker as @cjrhoads said earlier.
Age based on date of birth is a very basic contact property. I don’t understand why it’s not native.
This would be a valuable addition to HubSpot.
Currently using a manual process and excel, not ideal
@HubScott_Fahy how are you doing this? When I create an active list, select contact properties, and then select date of birth, I don’t have a more than or less than option for filtering
@mstanwyck - I’m using a custom date picker property rather than the built in version, and I think that gives you the right options. Sorry that wasn’t clearer!
I found a workaround for this using calculated properties.
First, create a property for “today’s date” found here: https://community.hubspot.com/t5/CRM/How-to-create-a-Today-s-date-date-property/td-p/389836
Then create a calculated property that will calculate the time between a “birthday property” and “today’s date”
@sharlener That worked awesome TY
For what it’s worth, I think this solves it now: Create 'Specific date' or 'Contact date property' contact-based workflows
Hubspot should really make it much easier for us to have an accurate age field. It should be integrated into HS, where if we put their birthdate, there’s an easy option for it to just calculate their age. It shouldn’t be a work-around we all have to do, but a simple function of HS. Please update!
A practical solution is to store the contact’s birth date in a custom Date Picker property and use a calculated field to determine their current age automatically. This approach enables accurate filtering, segmentation, and birthday-based automation while ensuring birth-date information remains usable for personalization and other date-dependent use cases.